NOTE: Resource bandwidth packages will not be supported since 00:00 on November 4, 2017, and public IP can be replaced be elastic IPs.
If a Nat Gateway has already bought some bandwidth packages, it can not bind elastic IP and you have to submit the work order to solve.
If you want to add public IP, you can use resource 'alicloud_eip_association' to bind several elastic IPs for one Nat Gateway.

NOTE: From version 1.7.1, this resource has deprecated bandwidth packages.
But, in order to manage stock bandwidth packages, version 1.13.0 re-support configuring 'bandwidth_packages'.

name - (Optional) Name of the nat gateway. The value can have a string of 2 to 128 characters, must contain only alphanumeric characters or hyphens, such as "-",".","_", and must not begin or end with a hyphen, and must not begin with http:// or https://. Defaults to null.

description - (Optional) Description of the nat gateway, This description can have a string of 2 to 256 characters, It cannot begin with http:// or https://. Defaults to null.

bandwidth_packages - (Optional) A list of bandwidth packages for the nat gatway. Only support nat gateway created before 00:00 on November 4, 2017. Available in v1.13.0+ and v1.7.1-.